Highland Railway Drummond 0-4-4T Passenger Tank

Hi Andy

I've not any FEP sheets with peel off layers, I have had them with glass protection & polarising sheets for the LCD screens.

The holes by just inside the vertical rivets are for the lubricators. There is also a pair of rivets on the outside edge of the wing plates by the wheel splashers.

Paul

 

Now this is not the first time I have tried to build one of these loco's.

Over twenty years ago I started to scratch build one of these in 4mm (P4), but it never got completed.

This is as far as I got, yesterday I did a bit of sorting - actually moving 1 pile of stuff to another location and found my 1st attempt

The chassis was a Bill Bedford etch.

So ...... I wonder if a 3D print would work.

I loaded the O gauge body into Chitubox, and scaled it to 57.14% (4/7 x 100)

Rotated 45 degrees in both the X & Y planes, added auto supports and printed it

And along side its O gauge big brother

Now it needs cleaning up, but even the cab hand rails printed. It would need the bottom of the boiler removing to allow the motor / gearbox to drive the front axle.

I think it turned out OK tho.

Bet you weren't expecting this post


Paul

 

Today feels like a day I'm not going to get back.

I'm still waiting for gears from Roxey / Markits, but decided to have a re-look at the chassis.

Assembly is not so much difficult but awkward, mainly due to the motor mount getting in the way, and future diss-assembly would be difficult.

Modification list

• Split the motor mount to allow easier assembly and future maint.
• Add the detail parts to the print
• Make the front guard Irons

Four hours later we have



and the motor mount top section



4 x M2 set screws will locate the motor into position - and clamp the lay shaft into position - I hope

Now just have to print it.

Paul

 

STL's loaded into Chitubox

2 copies used, 1 upside down and supports added to both



Estimated time to print 8h 20m

Pics to follow tomorrow

Paul

 

NUTS

Failed print

There appears to be a couple of failiure points, the motor top mounts printed fine, but the chassis had a few issues, can be seen on both chassis prints at the same time.

However one side completed so all the bits worked

As said earlier the motor mount top printed ok

And fits perfectly

So, carrying out my usual procedure when ever I get this sort of errors.

Clean vat, re-level the bed.

Instead of opening a new bottle of Eco resin, I swapped out to the Standard Grey resin, I do have the Craftsman resin, but I'm not testing it on a 8h print before dialing in the settings.

I'm running the same print - my Eco resin and Standard resin both use the same settings.

Paul

 

Hi Andy

The Oakamoor name board and the ballooning, may be over exposure, see what happens if you shorten the exposure.

Paul

 

Over the last week I've continued to work on the chassis

Although the prints failed, enough of the prints were good enough for testing.

Fitting the motor mount, I managed break one of the screw holes

So I beefed up the socket - the highlighted area was added.



To remove the support pips from the mating surfaces I printed at 45 degrees

Top Mount

And the main chassis

The top surface finish looks good

and so does the underside

.

The bracing of the supports are optional, but I'd recommend it and here's why

whatever caused the fail. the cross bracing recovered the break.

Paul

 

The only drawback of printing these test bodies and chassis, is some of them are actually quite good models, too good to put in in the scrap bin, and I'm not a native Scot or Yorkshireman.

But at over £70 for a set of wheels, they're always going to be lacking something ....... unless ........

1st set of wheels - 2ft 6in 8 spoke bogie wheels, no quatering needed

2nd set of wheels - 4ft 6in 13 spoke driving wheels

Now these are cosmetic only, not the correct profile, but will sit on a piece of track, and allow me to build any version of the loco as a static model, for a reasonable cost.

Paul

 

Nah....

I will probably end up with 2 chassis with green wheels for the Highland Railway locos, and a black chassis that I can swap between LMS / BR bodies.

So my options are
HR Drummond II livery - done
HR Cummings Livery - Done
LMS Full Crimson Lake livery
LMS Plain black
BR Plain Black "British Railways"
BR Lined Black Lion over Wheel

Only six versions to make

Paul